Short answer is, yes!
We offer the API for free in exchange for anonymous and aggregated data sharing. The data is shared exclusively with our parent company, Return Path, so they can build products which improve the entire email ecosystem - anti-phishing, spam prevention, and deliverability tools.
We are able to offer bulk pricing on a case by case basis. Contact firstname.lastname@example.org if you are interested in this option for opting out of data share.